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Compiler Warning C4694

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'class': a sealed abstract class cannot have a base-class 'base_class'

An abstract and sealed class cannot inherit from a reference type; a sealed and abstract class can neither implement the base class functions nor allow itself to be used as a base class.

For more information, see abstract, sealed, and Classes and Structs.

This warning is automatically promoted to an error. If you wish to modify this behavior, use #pragma warning.

Example

The following sample generates C4694.

// C4694.cpp
// compile with: /c /clr
ref struct A {};
ref struct B sealed abstract : A {};   // C4694